birthday = input('请输入出生年份(格式2019):')
year = int(birthday)
if year > 2000:
	print('00后')
elif year > 1990:
	print('90后')
elif year > 1980:
	print('80后')
elif year > 1970:
	print('70后')
elif year > 1960:
	print('60后')
else:
	print('老人家')